Board Thread:General Discussion/@comment-4785766-20170829171219/@comment-2606:6000:6901:B900:4909:37BF:6A41:BA3F-20180326032016

LegionZero, not only did he stay in the demon world, but he challenged Mundus and lost. He was then transformed into Nelo Angelo and used as a pawn until he was ultimately defeated by Dante who in turn defeated Mundus with the power of Sparda himself in the events of the first game. So even if he had such intentions he abandoned his humanity to embrace his demonic heritage even stating he's going to remain in the demon world because "This was our father's home..." to Dante before falling off that cliff edge meaning he throughly wanted to absolve himself of his humanity to live amongst the demons almost as a means of connecting with his departed father he essentially never knew. That alone makes that speculation that he was ever going to return with the power of Sparda to eradicate the demons null and void.

Quite honestly I don't believe his character is that of a dear protector to all those he cared about. He seems far too egocentrical of a character to think about anyone other than numero uno. While I can definitely see his yearning for an ulitmate power as stemming from that of deep-seated trauma, I don't see him thinking of Nero as his precious child that needs his protection let alone being even aware that he had a child in the first place. It's known for sure they share some bond, Nero and him,  though it seems to be nothing more than that of a bastard child reunited with his estranged father in a rather dysfunctional way to say the least.

Danny5357 seems content in his delusion though that Vergil had those intentions because it adds to that their personal enjoyment, but it seems more like a denial that Vergil really wasn't this great guy more than anything.